Bonilla-Avilés, Laura L.

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    Identificación de especies anamórficas de añublos polvorientos (Ascomycota: Orden Erysiphales) presentes en plantas ornamentales y aromáticas en Puerto Rico
    (2012) Bonilla-Avilés, Laura L.; Estévez-de Jensen, Consuelo; College of Agricultural Sciences; Rivera Vargas, Lydia I.; Román Avilés, Belinda; Department of Crops and Agro-Environmental Sciences; Rojas, Yuri
    In surveys conducted during 2010 to 2012 in central and southwest Puerto Rico the causal agents of powdery mildews in ornamental and aromatic herbs were identified. Weeds associated with the crops surveyed infected with powdery mildew were collected to determine if they were wild hosts and the source of primary inoculum. The morphological characterization of powdery mildew was performed using light microscopy, humid chamber conditions and scanning electron microscope (SEM). Polymerase chain reaction (PCR) and sequencing of ITS region of the rDNA were used to identify the different species. Twenty samples were collected with symptoms and signs of powdery mildew, eighteen of ornamental plants and two herb species. We identified fifteen species of different genera affecting economically important crops. The most important genus identified was Erysiphe, a total of nine different species affecting ornamental plants. New reports of powdery mildew for Puerto Rico in ornamental and herb plants are Podosphaera fusca affecting Gerbera jamesonii, Erysiphe acalyphae in Acalypha wilkesiana, E. quercicola infecting Angelonia augustifolia, E. peruviana in Tecoma capensis, E. polonica in Hydrangea macrophylla and Oidium poinsettia on Euphorbia heterophylla. Within herb plants E. heraclei and E. pisi were identified in Anethum graveolens and Eryngium foetidum respectively. In common weeds and nurseries samples E. rusellii was identified as the causal agent of powdery mildew in Oxalis barrelieri and Oidium poinsettia in Euphorbia heterophylla, the same pathogen that was identified in E. pulcherrima. It is very clear that there is a high specificity between powdery mildew, hosts or between families; the case of the euphorbias, E. pulcherrima and E. heterophylla was identified O. poinsettiae as the causal agent of powdery mildew.